On 14 October 1962, an American U-2 spy plane took pictures of launch pads for medium-range ballistic missiles on Cuba. These could carry nuclear warheads that could destroy US cities. US intelligence discovered a fleet of Soviet ships sailing to Cuba, presumably with the missiles themselves on board. It was believed the missiles could become operational in two weeks. Kennedy could not allow missiles to be placed on Cuba, but a military response risked all-out war. On 16 October, called an Executive Committee (ExComm) to discuss solutions. 'Hawks' argued for a military response while 'doves' wanted a peaceful solution. On 22 October, Kennedy put a naval blockade around Cuba. On 24 October, the Soviet ships reached the blockade and turned around. On 26 October, Khrushchev sent Kennedy a telegram offering to remove missiles from Cuba if America agreed not to invade. On 27 October, Khrushchev sent another telegram saying he would remove the missiles only if US missiles in Turkey were not removed. Also on 27 October, an American U2 spy plane was shot down. Khrushchev ignored the second telegram and agreed to the first telegram. However, his brother, Robert Kennedy, did secretly agree to remove the Turkish missiles.